3.13 GNSS Status
The GPS status page enables you to view the status
of the available satellites that are compatible with
your receiver.
The satellite constellations are used to position your
vessel in the Chart and Weather applications. You
can set up your receiver and check its status from
the GPS Set-up menu: Homescreen > Set-up >
System Settings > GPS Set-up. For each satellite,
the screen provides the following information:
1. Sky view
2. Satellite status
3. Position and x information
Sky view
Sky view is a visual representation that shows
the position of navigation satellites and their type.
Satellite types are:
• Circle — A circle identies a satellite from the
GPS constellation.
• * Diamond — A diamond identies a satellite from
the GLONASS constellation.
• Square — A square identies an (SBAS)
differential satellite.
Note: * GLONASS satellites are only available
when connected to a compatible GNSS receiver.
Refer to the Technical specication for your
product to identify your receiver type.
Satellite status area
The Satellite status area displays the following
information about each satellite:
• Type — Identies which constellation the satellite
belongs to.
• ID — Displays the satellites identication number.
• CNO (Carrier-to-noise ratio) — Displays the signal
strength of each satellite shown in the Sky view:
– Grey = searching for satellite
– Green = satellite in use
– Orange = tracking satellite
• Azimuth and Elevation — Provides the angle of
elevation and azimuth between the location of the
receiver and the satellite.
Position and x information
The following positional and x information is
provided:
• Horizontal Dilution of Precision (HDOP)
— HDOP is a measure of satellite navigation
accuracy, calculated from a number of factors
including satellite geometry, system errors in
the data transmission and system errors in the
receiver. A higher gure signies a greater
positional error. A typical receiver has an accuracy
of between 5 and 15 m. As an example, assuming
a receiver error of 5 m, an HDOP of 2 would
represent an error of approximately 15 m. Please
remember that even a very low HDOP gure is
NO guarantee that your receiver is providing an
accurate position. If in doubt, check the displayed
vessel position in the Chart application against
your actual proximity to a known charted object.
• Estimated Horizontal Position Error (EHPE)
— EHPE is a measure of the estimated error of
a position x in the horizontal plane. The value
displayed indicates that your position is within a
circle radius of the stated size 50% of the time.
• Fix status — indicates the actual mode the
receiver is reporting:
– Fix — Satellite x has been acquired.
– No Fix — No satellite x can be acquired.
– D Fix — A differential beacon x has been
acquired.
– SD Fix — A differential satellite x has been
acquired.
• Position — Displays the latitude and longitude
position of your receiver.
• Date / Time — Displays the current date and time
generated by the position x in UTC format .
• Mode — Identies wether the receiver is working
in differential mode or non-differential mode.
• Datum — The receiver's datum setting affects
the accuracy of the vessel position information
displayed in the Chart application. In order for your
receiver and MFD to correlate accurately with your
paper charts, they must be using the same datum.
Global Navigation Satellite Systems
(GNSS)
A GNSS is a system of satellites that provides
autonomous geo-spatial positioning that allows
electronic devices with compatible receivers to
determine their location (longitude, latitude and
altitude).
Operational GNSS
• GPS — (NAVSTAR) Global Positioning SystemUS
owned constellation of satellites that became fully
operational in 1995.
• GLONASS acronym for "GLObalnaya
NAavigatsionnaya Sputnikovaya Sistema" or
“Global Navigation Satellite Systems” — Russian
owned constellation of satellites that offered global
coverage in 2010.
Planned GNSS
• Galileo — European satellite constellation in initial
deployment phase due to become operational in
2020.
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